When a project is classified as resource-constrained, a resource constraint exists, and positive slack is insufficient, then the project duration is typically extended.
A project is deemed resource-constrained when there is a risk regarding the project resources. Slack refers to the amount of time any part or task in a project can be delayed till it bumps into others and starts affecting the finish date.
A positive slack means there is a specific amount of time a task can be delayed without any delay in the final project duration while a negative slack means that there is not enough time for all tasks to be completed within the predetermined time frame.
Both resource constraints and insufficient positive slack can affect timely delivery of projects and the delivery date has to be delayed.
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